Alert
Alert adjective - Paying close attention usually for the purpose of anticipating approaching danger or opportunity.
Usage example: she needed to stay alert throughout the train ride so as not to miss her stop
Prepared and alert are semantically related. In some cases you can use "Prepared" instead an adjective "Alert".
Mutual synonyms
Both words in one sentence
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The Red forces there were the only ones to pass the Red Army's own standards of combat readiness just one month previously, and were the only Red Army forces actually on alert and prepared for military action on 22 June.
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Also be prepared to have an alert shopkeeper staking out at the next few level exits.
Source: Video Game / Spelunky - Worse still, none of the Soviet troops are prepared to fight—they aren't even on alert and they certainly haven't manned any defensive positions or brought their weapons and vehicles out of storage.
Cite this Source
Prepared and Alert. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/alert/prepared
Alert & Prepared. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/alert/prepared>.
Prepared or Alert. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/alert/prepared.
Google Ngram Viewer shows how "alert" and "prepared" have occurred on timeline